Geofluids / 2019 / Article / Fig 5

Research Article

Geochemistry and Genesis of Oil and Gas Seeps in the Junggar Basin, NW China: Implications for Hybrid Petroleum Systems

Figure 5

Plots of selected molecular geochemical parameters for oil-seep, crude-oil, and source-rock samples from the northwestern Junggar Basin. (a) δ13C (in ‰ relative to the VPDB standard) vs. SA/SARA; (b) C19T/C20T vs. C24Te/C26T; (c) C20T/C21T vs. C21T/C23T; (d) Ts/Tm vs. G/C30H; (e) C29H/C30H vs. C35S/C34S; (f) C27/C28ααα20R vs. C28/C29ααα20R; (g) C29ααα20S/(20R+20S) vs. C29αββ/(αββ+ααα); (h) C24Te/C30H vs. Dia/Reg. Abbreviations: SA = saturates+aromatics in %; SARA = saturates+aromatics+resins+asphaltenes in %; T = tricyclic terpane; Te = tetracyclic terpane; G = gammacerane; H = hopane; S = 22S hopane; Dia = diasteranes; Reg = regular steranes. Data from Table 2.

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